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A casual stroll through the lunatic asylum shows that faith does not prove anything.

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One ought to hold on to one's heart; for if one lets it go, one soon loses control of the head too.

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In individuals, insanity is rare; but in groups, parties, nations and epochs, it is the rule.

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One is healthy when one can laugh at the earnestness and zeal with which one has been hypnotized by any single detail of one's life.

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Madness is something rare in individuals — but in groups, parties, peoples, and ages, it is the rule.